There are two flush time settings on our light commercial and whole house TV reverse osmosis systems, one for flush at system startup and the second for flush at tank full shut down. The most important is the flush at shut down, which replaces very high TDS concentrate that resides inside the membrane when the system stops running with clean product water. The startup flush is less significant since the shut down flush leaves clean product water in the membrane, but still provides a fresh membrane upon start up, especially if the system is left to sit idle for periods of time.

For a 2000 GPD system the PureFlush will take about 1 or 2 gallons from the 300 gallon product water tank when it flushes the membrane. Without this flush, when the system stops running, the residual water inside the membrane vessel will have a very high salt content, much higher than the feed water since it is concentrate or brine. If left this way that salt content will go through the membrane by osmosis so you will have salty water on the product side of the membrane. Membranes only separate salt from water when they are under pressure (reverse osmosis). Remove the pressure and salts will pass through the membrane. This means when the system re-starts it will flush out that salty water from the product side of the membrane into the product storage tank. So with the PureFlush when the system stops operating a valve opens for about a minute and lets purified water from the storage tank flow into the feed of the membrane pressure vessel. This pushes out the salty concentrate water and leaves the membrane soaking in pure water during the down time which gives you pure water as soon as the system restarts.

Another benefit with the PureFlush is that accelerated scaling of the membrane, which can happen when you leave the membrane soaking in highly mineralized water during down times, is avoided. When you connect to the flush inlet connector at the rear of the system it should be to a pressurized source of product water, usually to the outlet plumbing of the pump that is drawing water from the product storage tank and providing it to the house or usage.

This PureFlush technology is just one of the premium qualities RainDance offers standard with all of our whole house & commercial reverse osmosis and nanofiltration systems. Our engineers have held to their goal of over build and over design, resulting in quality assurance in the performance and lifespan of our membrane water treatment systems.

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